Climate Comfort Score
44/100
Moderate
NOAA 1991–2020 normals 52°F annual avg Public-domain federal data
Hermiston, OR Climate
Explore average temperature, rainfall, and comfort score sourced from NOAA NCEI's 1991–2020 climate normals →
- 52°F
- Avg annual temp
- 44/100
- Comfort score
- 8.8"
- Annual precip
- 163d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Hermiston
Hermiston, Oregon averages 52°F a year and scores 44/100 on the comfort index - moderate, milder than 8% of U.S. cities.
- 52°F
- annual average temperature (NOAA normal)
- 44/100
- comfort score, milder than 8% of U.S. cities
- 8.8"
- precipitation, annual total
- 163 days
- frost-free days per growing season
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
52°F (11°C)
Avg High
65°F
Avg Low
39°F
Annual Precip
8.8"
Comfort Score
44/100
Moderate
Avg Annual Temperature
52°F
30-year mean (NOAA NCEI)
Annual Precipitation
8.8"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Hermiston) 44.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Moderate for the Hermiston area.
How Hermiston compares to every U.S. city
Hermiston's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
44 Top 92% higher than 8% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Hermiston
MethodologyThe chart below traces how the U.S. land temperature anomaly has moved against the global mean since 1900. For Hermiston, the NOAA 1991-2020 normal captures average conditions across that spread - notably, the most recent decade runs warmer than the 30-year mean itself.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 42°F (5°C) | 26°F (-3°C) | 34°F (1°C) | 1.3" | 23.6 | 0.0 |
| February | 48°F (9°C) | 26°F (-3°C) | 37°F (3°C) | 0.8" | 21.8 | 0.0 |
| March | 58°F (14°C) | 31°F (0°C) | 45°F (7°C) | 0.8" | 16.7 | 0.0 |
| April | 66°F (19°C) | 37°F (3°C) | 51°F (11°C) | 0.8" | 5.8 | 0.0 |
| May | 74°F (23°C) | 45°F (7°C) | 60°F (15°C) | 0.9" | 1.0 | 2.1 |
| June | 81°F (27°C) | 51°F (11°C) | 66°F (19°C) | 0.7" | 0.1 | 6.0 |
| July | 89°F (32°C) | 56°F (13°C) | 73°F (23°C) | 0.2" | 0.0 | 17.4 |
| August | 89°F (32°C) | 54°F (12°C) | 71°F (22°C) | 0.2" | 0.1 | 16.5 |
| September | 80°F (27°C) | 46°F (8°C) | 63°F (17°C) | 0.3" | 0.2 | 4.0 |
| October | 66°F (19°C) | 36°F (2°C) | 51°F (11°C) | 0.8" | 9.4 | 0.2 |
| November | 51°F (10°C) | 29°F (-2°C) | 40°F (4°C) | 1.1" | 19.3 | 0.0 |
| December | 42°F (5°C) | 26°F (-4°C) | 34°F (1°C) | 1.0" | 24.2 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 1.3"
11.4 days with precipitation
February 0.8"
9.2 days with precipitation
March 0.8"
9.4 days with precipitation
April 0.8"
6.9 days with precipitation
May 0.9"
7.5 days with precipitation
June 0.7"
5.3 days with precipitation
July 0.2"
1.3 days with precipitation
August 0.2"
2.0 days with precipitation
September 0.3"
3.5 days with precipitation
October 0.8"
7.8 days with precipitation
November 1.1"
10.1 days with precipitation
December 1.0"
12.8 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
October 7
50% probability date
Last Spring Freeze
April 27
50% probability date
Growing Season
163 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,352
Higher = more heating needed
Cooling Degree Days
624
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
What Hermiston's climate means for you
Hermiston runs 52°F a year - peaking in July, coldest in December.
- Gardeners get about 163 frost-free days, with the last spring freeze near April 27 - plan the planting calendar around it, not the regional average.
- Energy bills track 5,352 heating and 624 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Hermiston, OR
Hermiston, Oregon runs an annual average of 52°F, ranging from a mean daily high of 65°F to a mean daily low of 39°F, per NOAA's 1991–2020 climate normals. July is typically the warmest month of the year, while December is the coldest. Drawn from station USC00353818, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Hermiston receives roughly 8.8 inches of precipitation each year, predominantly as rainfall. The frost-free season averages 163 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 27 and the first fall freeze near October 7. For energy use, 5,352 heating degree days and 624 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Hermiston scores 44/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above are the practical planning tool: mild highs and lows land in the shoulder seasons, July-driven heat peaks in summer, and December-driven cold sets in over deep winter. These are thirty-year averages, not a forecast - any single year can run warmer, wetter, drier, or cooler than the normal.
Frequently Asked Questions
What is the average temperature in Hermiston, OR? ▼
The average annual temperature in Hermiston, Oregon is 52°F. The warmest month averages 89°F (32°C) and the coldest averages 26°F (-4°C).
How much rain does Hermiston get? ▼
Hermiston receives 8.8 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Hermiston? ▼
Hermiston has a climate comfort score of 44/100 (Moderate), milder than 8% of U.S. cities in the PlainClimate database.
When is the growing season in Hermiston? ▼
Hermiston has approximately 163 frost-free days per year, with the last spring freeze around April 27 and the first fall freeze around October 7.
How much energy does heating and cooling require in Hermiston? ▼
Hermiston has 5,352 heating degree days and 624 cooling degree days annually, a heating-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Hermiston climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00353818 near Hermiston.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00353818. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.